Instrument Transformers
Current Transformers
Figure 5 illustrates bushing (toroidal) current transformers
installed in the primary compartment of a circuit breaker.
The circuit breaker roof bushings pass through the trans-
formers. Type BCM current transformers are of the toroi-
dal type mounted in the circuit breaker primary compart-
ment. Up to two current transformers may be mounted
around each roof bushing. The bushing current transformer
connections are wired to separate terminal blocks located
in the control and relay compartment.
Hazardous voltage.
Will cause death, serious injury, and
property damage.
Current Transformers must not be operated
with an open circuit and must be either
connected to a burden or short circuited and
grounded at the terminal blocks.
Figure 5. Type BCM CT’s Installed in primary compartment.
View shown is looking up into cabinet roof
from below
2088-98
9
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